Hello Sanchit,
Thanks for contacting us. But unfortunately our plugin works with default joomla registration. We have to check if that will be possible with the extension you are using or not. If it can be then we can add it's support, but it can be done as custom paid service.
So if you are okay with it then you can email us at This email address is being protected from spambots. You need JavaScript enabled to view it. with the kit of "Improved AJAX Login & Register".